Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
I'm so sorry to hear of this additional complication. Let us know how he progresses.
I am sending TONS of positive thoughts your way and your family's way and your nephew's way. We're all behind you and I hope he starts making a good turn about soon! Keep us posted.